Love the idea and happy to add enough to the letter cost to cover any loss of revenue to the association due to payPal fees. It's a particular pain for me as I have to stand in line to get a bank draft in US funds as well.
I needed a draft for my membership last year and this year used payPal which was great. I picked up a gift membership for a friend and may get a couple more because it is so darned easy. Like Scott I'd have two (3?) more letters by now.
Of course having a paypal account is also the reason my eBay purchases have gone up.....
If it makes Chuck's life easier too than that is another excellent reason. Look forward to it.